[Issue 13594] std.algorithm.nextPermutation for fixed size arrays too

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13594

--- Comment #3 from hsteoh at quickfur.ath.cx ---
The permutation algorithm needs to iterate over subarrays of varying lengths
anyway, so losing the compile-time length of the overall array isn't that big
of a deal.

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